Comparison of Scramjet and Shcramjet Propulsion for an Hypersonic Waverider Configuration
Bibliographic record
Abstract
Ramjet propulsion is often proposed for airbreathing applications with speeds higher than Mach 3. However, for speeds higher than Mach 5, the performance of a ramjet drops significantly and the scramjet is the preferred option. The shockinduced combustion ramjet, or shcramjet, is also an interesting alternative at higher flight speeds. Its configuration differs significantly from the scramjet with a longer intake to provide for fuel injection and evaporation while maintaining a lower air temperature to prevent ignition of the flammable mixture with a slower pressure recovery. A detonation wave completes the pressure recovery and ensures ignition of the air-fuel mixture upon reaching the combustion chamber. This longer intake, necessary for adequate air and fuel mixing, can be combined with a much shorter combustion section. Overall, when the entire vehicle is considered, the shcramjet may result in improved performance for the same mission over the scramjet-powered vehicle. To complete a preliminary design of scramjet and shcramjet vehicles powered at hypersonic speeds, an on-design computational tool was developed to optimize their configurations and compare various performance parameters as a function of Mach number in the range from 7 to 12. In order to compare common baselines for the scramjet and the shcramjet, a configuration was chosen with a mass limited to 430 kg for validation with other design tools. Eventually the configurations were optimized for a balance between the thrust-drag and lift-weight forces by tailoring the external geometry and configuring the internal components to offer the best performance for both vehicles. Since a mixing submodel with not yet available to interact with the other submodels, the various performance parameters were calculated and presented graphically for constant combustion efficiency values. Ultimately both configurations give approximately the same performance when compared with the same combustion efficiency. The resulting hypersonic shapes are presented with detailed explanations of their ondesign configurations as the Mach number is varied from 7 to 12.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".